[3320] | 1 | /*
|
---|
| 2 | * Copyright (C) 2010 Timo Teras <timo.teras@iki.fi>
|
---|
| 3 | *
|
---|
| 4 | * This is free software, licensed under the GNU General Public License v2.
|
---|
| 5 | */
|
---|
| 6 | #include <sys/file.h>
|
---|
| 7 | #include "libbb.h"
|
---|
| 8 |
|
---|
| 9 | int flock_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
|
---|
| 10 | int flock_main(int argc UNUSED_PARAM, char **argv)
|
---|
| 11 | {
|
---|
| 12 | int mode, opt, fd;
|
---|
| 13 | enum {
|
---|
| 14 | OPT_s = (1 << 0),
|
---|
| 15 | OPT_x = (1 << 1),
|
---|
| 16 | OPT_n = (1 << 2),
|
---|
| 17 | OPT_u = (1 << 3),
|
---|
| 18 | OPT_c = (1 << 4),
|
---|
| 19 | };
|
---|
| 20 |
|
---|
| 21 | #if ENABLE_LONG_OPTS
|
---|
| 22 | static const char getopt_longopts[] ALIGN1 =
|
---|
| 23 | "shared\0" No_argument "s"
|
---|
| 24 | "exclusive\0" No_argument "x"
|
---|
| 25 | "unlock\0" No_argument "u"
|
---|
| 26 | "nonblock\0" No_argument "n"
|
---|
| 27 | ;
|
---|
| 28 | applet_long_options = getopt_longopts;
|
---|
| 29 | #endif
|
---|
| 30 | opt_complementary = "-1";
|
---|
| 31 |
|
---|
| 32 | opt = getopt32(argv, "+sxnu");
|
---|
| 33 | argv += optind;
|
---|
| 34 |
|
---|
| 35 | if (argv[1]) {
|
---|
| 36 | fd = open(argv[0], O_RDONLY|O_NOCTTY|O_CREAT, 0666);
|
---|
| 37 | if (fd < 0 && errno == EISDIR)
|
---|
| 38 | fd = open(argv[0], O_RDONLY|O_NOCTTY);
|
---|
| 39 | if (fd < 0)
|
---|
| 40 | bb_perror_msg_and_die("can't open '%s'", argv[0]);
|
---|
| 41 | //TODO? close_on_exec_on(fd);
|
---|
| 42 | } else {
|
---|
| 43 | fd = xatoi_positive(argv[0]);
|
---|
| 44 | }
|
---|
| 45 | argv++;
|
---|
| 46 |
|
---|
| 47 | /* If it is "flock FILE -c PROG", then -c isn't caught by getopt32:
|
---|
| 48 | * we use "+" in order to support "flock -opt FILE PROG -with-opts",
|
---|
| 49 | * we need to remove -c by hand.
|
---|
| 50 | * TODO: in upstream, -c 'PROG ARGS' means "run sh -c 'PROG ARGS'"
|
---|
| 51 | */
|
---|
| 52 | if (argv[0]
|
---|
| 53 | && argv[0][0] == '-'
|
---|
| 54 | && ( (argv[0][1] == 'c' && !argv[0][2])
|
---|
| 55 | || (ENABLE_LONG_OPTS && strcmp(argv[0] + 1, "-command") == 0)
|
---|
| 56 | )
|
---|
| 57 | ) {
|
---|
| 58 | argv++;
|
---|
| 59 | }
|
---|
| 60 |
|
---|
| 61 | if (OPT_s == LOCK_SH && OPT_x == LOCK_EX && OPT_n == LOCK_NB && OPT_u == LOCK_UN) {
|
---|
| 62 | /* With suitably matched constants, mode setting is much simpler */
|
---|
| 63 | mode = opt & (LOCK_SH + LOCK_EX + LOCK_NB + LOCK_UN);
|
---|
| 64 | if (!(mode & ~LOCK_NB))
|
---|
| 65 | mode |= LOCK_EX;
|
---|
| 66 | } else {
|
---|
| 67 | if (opt & OPT_u)
|
---|
| 68 | mode = LOCK_UN;
|
---|
| 69 | else if (opt & OPT_s)
|
---|
| 70 | mode = LOCK_SH;
|
---|
| 71 | else
|
---|
| 72 | mode = LOCK_EX;
|
---|
| 73 | if (opt & OPT_n)
|
---|
| 74 | mode |= LOCK_NB;
|
---|
| 75 | }
|
---|
| 76 |
|
---|
| 77 | if (flock(fd, mode) != 0) {
|
---|
| 78 | if (errno == EWOULDBLOCK)
|
---|
| 79 | return EXIT_FAILURE;
|
---|
| 80 | bb_perror_nomsg_and_die();
|
---|
| 81 | }
|
---|
| 82 |
|
---|
| 83 | if (argv[0])
|
---|
| 84 | return spawn_and_wait(argv);
|
---|
| 85 |
|
---|
| 86 | return EXIT_SUCCESS;
|
---|
| 87 | }
|
---|